The full report is worth reading and provides a list of references that support the statistics. The biggest takeaway is that publishers need to continue to architect and markup content so that it is easily packaged and deliverable across all outputs.

It's increasingly important to break out the content from its container and markup chunks of content in a way to improve online discoverabilty, which can then be purchased in whatever format the end user wants. One of the strengths of the ePub standard is that it includes packaging, metadata, and content as cleanly articulated components. We welcome the opportunity to discuss how we are helping publishers implement ePub in their workflows.